3A – OEM Type
OEM oil line connects crossover pipe to thermostat. Fits all 911/930 fitted with 1A or 1B. Does not fit 72 911. Cars 65-71 are recommended to use item 2B because they lack a wheel well channel to hold this line, tire clearance is thus limited.

3B – High Clearance Specialty Type
Specialty pipe interchanges with 2A and connects crossover pipe to thermostat. Provides maximum clearance for fitting wide tires. Unlike the factory line that passes between the tire and the inner wheel well, this line arches above the tire to give superior tire clearance. The critical area between tank and tire is a purpose-formed hard line for maximum clearance. Cars 65-71 are highly recommended to use this line for improved tire clearance.

3C – High Clearance Specialty Type
High clearance oil line x-over to thermostat, 30mm. Comprised of the following items: 0210002b, 0210000a, 015110
This part also goes by the following cross reference.
Cross Reference Part Number: